From £17,692
Relax... you have found a reliable extension builder in Northampton. Wright Building is a friendly and reliable company based in Northampton who co...
From £17,436
Northampton, NN1
L.D.Design&Build means a holistic approach to building, one simple way of finding everything you need for your building project under the ‘same r...
From £17,612
Northampton, NN4
Need to find an Extension Builder near you for all your extension buildering work?
The Builders - Northampton Limited provides a local, tru...
From £17,116
Northampton, NN2
Brickwork specialist with 30 years experience.
From repointing, small repairs up to building extensions and houses.
Stonework...
From £17,372
Northampton, NN1
Need an Extension Builder in Northampton? DAB & K&G Building Services has been helping local clients (20 mile radius) with their extension builderi...
From £17,100
Northampton, NN3
M Home Renovations is an established extension buildering business in Northampton. We come highly recommended and provide competitive quotes for yo...
From £16,908
Northampton, NN2
We have a great team behind us, we offer friendly, competitive and professional service. With years of experience among the trades, there's not muc...
From £17,428
Fountain Construction Ltd is an established and experienced local extension builder in Northampton. Please contact us for a free, no obligation quo...
From £17,364
Walsh Builders Ltd is an established and experienced local extension builder in Northampton. Please contact us for a free, no obligation quote and ...
From £17,228
ATJ BUILDING & GROUNDWORKS is a trusted extension builder serving customers in Northampton and the surrounding area. Contact us to today to get a c...

Underpinning ranges from £16,908 (Artizan Roofing based in NN2) to £17,692 (Wright Building based in NN4), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in Northampton by posting a job with HaMuch and we will send it to extension builders in Northampton.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Northampton | £35 | £239 |
| Underpin A Building near Wellingborough | £39 | £251 |
| Underpin A Building near Daventry | £31 | £230 |
| Underpin A Building near Rushden | £34 | £231 |
| Underpin A Building near Kettering | £34 | £237 |
| Underpin A Building near Milton Keynes | £39 | £263 |
| Underpin A Building near Market Harborough | £31 | £217 |
| Underpin A Building near Rugby | £31 | £224 |
| Underpin A Building near Bletchley | £39 | £265 |
| Underpin A Building near Bedford | £45 | £278 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,326

Two storey extension - £87,738

Build a timber frame extension - £25,826

Build a swimming pool - £80,826

Single storey extension - £51,512

Side return extension - £39,538

Install an RSJ - £2,026

Outbuilding - £9,826

Build a Mansard loft conversion - £51,826

Loft conversion - £32,115

Build a kitchen extension - £41,826

Hip to gable loft conversion - £41,826

Granny annexe - £86,826

Garden office - £9,826

Convert a Garage - £15,826

Garage - £18,326

Build a flat roof extension - £21,826

Build a dormer loft conversion - £41,826

Concrete foundations - £6,076

Convert a bungalow loft - £28,826

Convert a basement - £35,538